aboutsummaryrefslogtreecommitdiffstats
path: root/lib/mnesia/src/mnesia_frag_old_hash.erl
diff options
context:
space:
mode:
authorBjörn-Egil Dahlberg <[email protected]>2016-08-23 18:07:30 +0200
committerBjörn-Egil Dahlberg <[email protected]>2017-01-25 11:56:28 +0100
commit995ab280a4dd050acbac0d2b824bcb3178811ae6 (patch)
tree4c15e72f04376a6508ff82a119daffd783f8d63e /lib/mnesia/src/mnesia_frag_old_hash.erl
parent4432ac28c118622c2994440b5be3bff0bc77cc83 (diff)
downloadotp-995ab280a4dd050acbac0d2b824bcb3178811ae6.tar.gz
otp-995ab280a4dd050acbac0d2b824bcb3178811ae6.tar.bz2
otp-995ab280a4dd050acbac0d2b824bcb3178811ae6.zip
mnesia: Remove mnesia_frag_old_hash hash module
The module mnesia_frag_old_hash utilized the broken erlang:hash/2 function which has been deprecated for a long time. Since erlang:hash/2 is now removed there is no point in having this module any more.
Diffstat (limited to 'lib/mnesia/src/mnesia_frag_old_hash.erl')
-rw-r--r--lib/mnesia/src/mnesia_frag_old_hash.erl133
1 files changed, 0 insertions, 133 deletions
diff --git a/lib/mnesia/src/mnesia_frag_old_hash.erl b/lib/mnesia/src/mnesia_frag_old_hash.erl
deleted file mode 100644
index b246c76236..0000000000
--- a/lib/mnesia/src/mnesia_frag_old_hash.erl
+++ /dev/null
@@ -1,133 +0,0 @@
-%%
-%% %CopyrightBegin%
-%%
-%% Copyright Ericsson AB 2002-2016. All Rights Reserved.
-%%
-%% Licensed under the Apache License, Version 2.0 (the "License");
-%% you may not use this file except in compliance with the License.
-%% You may obtain a copy of the License at
-%%
-%% http://www.apache.org/licenses/LICENSE-2.0
-%%
-%% Unless required by applicable law or agreed to in writing, software
-%% distributed under the License is distributed on an "AS IS" BASIS,
-%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-%% See the License for the specific language governing permissions and
-%% limitations under the License.
-%%
-%% %CopyrightEnd%
-%%
-
-%%
-%%%----------------------------------------------------------------------
-%%% Purpose : Implements hashing functionality for fragmented tables
-%%%----------------------------------------------------------------------
-
--module(mnesia_frag_old_hash).
-%%-behaviour(mnesia_frag_hash).
-
--compile({nowarn_deprecated_function, {erlang,hash,2}}).
-
-%% Hashing callback functions
--export([
- init_state/2,
- add_frag/1,
- del_frag/1,
- key_to_frag_number/2,
- match_spec_to_frag_numbers/2
- ]).
-
--record(old_hash_state,
- {n_fragments,
- next_n_to_split,
- n_doubles}).
-
-%% Old style. Kept for backwards compatibility.
--record(frag_hash,
- {foreign_key,
- n_fragments,
- next_n_to_split,
- n_doubles}).
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-init_state(_Tab, InitialState) when InitialState == undefined ->
- #old_hash_state{n_fragments = 1,
- next_n_to_split = 1,
- n_doubles = 0};
-init_state(_Tab, FH) when is_record(FH, frag_hash) ->
- %% Old style. Kept for backwards compatibility.
- #old_hash_state{n_fragments = FH#frag_hash.n_fragments,
- next_n_to_split = FH#frag_hash.next_n_to_split,
- n_doubles = FH#frag_hash.n_doubles}.
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-add_frag(State) when is_record(State, old_hash_state) ->
- SplitN = State#old_hash_state.next_n_to_split,
- P = SplitN + 1,
- L = State#old_hash_state.n_doubles,
- NewN = State#old_hash_state.n_fragments + 1,
- State2 = case trunc(math:pow(2, L)) + 1 of
- P2 when P2 == P ->
- State#old_hash_state{n_fragments = NewN,
- next_n_to_split = 1,
- n_doubles = L + 1};
- _ ->
- State#old_hash_state{n_fragments = NewN,
- next_n_to_split = P}
- end,
- {State2, [SplitN], [NewN]}.
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-del_frag(State) when is_record(State, old_hash_state) ->
- P = State#old_hash_state.next_n_to_split - 1,
- L = State#old_hash_state.n_doubles,
- N = State#old_hash_state.n_fragments,
- if
- P < 1 ->
- L2 = L - 1,
- MergeN = trunc(math:pow(2, L2)),
- State2 = State#old_hash_state{n_fragments = N - 1,
- next_n_to_split = MergeN,
- n_doubles = L2},
- {State2, [N], [MergeN]};
- true ->
- MergeN = P,
- State2 = State#old_hash_state{n_fragments = N - 1,
- next_n_to_split = MergeN},
- {State2, [N], [MergeN]}
- end.
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-key_to_frag_number(State, Key) when is_record(State, old_hash_state) ->
- L = State#old_hash_state.n_doubles,
- A = erlang:hash(Key, trunc(math:pow(2, L))),
- P = State#old_hash_state.next_n_to_split,
- if
- A < P ->
- erlang:hash(Key, trunc(math:pow(2, L + 1)));
- true ->
- A
- end.
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-match_spec_to_frag_numbers(State, MatchSpec) when is_record(State, old_hash_state) ->
- case MatchSpec of
- [{HeadPat, _, _}] when is_tuple(HeadPat), tuple_size(HeadPat) > 2 ->
- KeyPat = element(2, HeadPat),
- case has_var(KeyPat) of
- false ->
- [key_to_frag_number(State, KeyPat)];
- true ->
- lists:seq(1, State#old_hash_state.n_fragments)
- end;
- _ ->
- lists:seq(1, State#old_hash_state.n_fragments)
- end.
-
-has_var(Pat) ->
- mnesia:has_var(Pat).